20437621 has 8 divisors (see below), whose sum is σ = 22101120. Its totient is φ = 18825408.

The previous prime is 20437619. The next prime is 20437631. The reversal of 20437621 is 12673402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20437621 - 2¹ = 20437619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20437631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11991 + ... + 13588.

It is an arithmetic number, because the mean of its divisors is an integer number (2762640).

Almost surely, 2^20437621 is an apocalyptic number.

It is an amenable number.

20437621 is a deficient number, since it is larger than the sum of its proper divisors (1663499).

20437621 is a wasteful number, since it uses less digits than its factorization.

20437621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25643.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20437621 is about 4520.7987126171. The cubic root of 20437621 is about 273.4073048192.

The spelling of 20437621 in words is "twenty million, four hundred thirty-seven thousand, six hundred twenty-one".